EP 0289998 B1 19920429 - TENNIS BALL
Title (en)
TENNIS BALL
Publication
Application
Priority
- JP 4640688 U 19880406
- JP 6923987 U 19870508
Abstract (en)
[origin: EP0289998A2] Hollow tennis balls (A) comprise a hollow spherical core (3) of rubber composition and felt (1) covering the hollow spherical core (3), wherein physical properties of the spherical core (3) such as forward deformation, return deformation and rebound are differed corresponding to the skill, physical constitution, physical strength and athletic ability of players.
IPC 1-7
IPC 8 full level
A63B 39/00 (2006.01); A63B 43/00 (2006.01)
CPC (source: EP US)
A63B 39/00 (2013.01 - EP US); A63B 2043/001 (2013.01 - EP US); A63B 2208/12 (2013.01 - EP US); Y10S 273/20 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT SE
DOCDB simple family (publication)
EP 0289998 A2 19881109; EP 0289998 A3 19890503; EP 0289998 B1 19920429; DE 3870513 D1 19920604; JP H0522200 Y2 19930607; JP S6442067 U 19890314; US 4946166 A 19900807; US 4947466 A 19900807
DOCDB simple family (application)
EP 88107123 A 19880504; DE 3870513 T 19880504; JP 4640688 U 19880406; US 39912989 A 19890828; US 42271889 A 19891017